FritsHoogland

Return 0x00007f225b35581a /lib64/libpthread.so.0:__read_nocancel+0x00000000000f returns: 0x151
Return 0x000000000cf1036d /u01/app/oracle/product/12.1.0.2/dbhome_1/bin/oracle:sntpread+0x00000000003d returns: 0
Return 0x000000000cf102c0 /u01/app/oracle/product/12.1.0.2/dbhome_1/bin/oracle:ntpfprd+0x0000000000c0 returns: 0
Return 0x000000000cef19dd /u01/app/oracle/product/12.1.0.2/dbhome_1/bin/oracle:nsbasic_brc+0x00000000032d returns: 0
Return 0x000000000cef164a /u01/app/oracle/product/12.1.0.2/dbhome_1/bin/oracle:nsbrecv+0x00000000005a returns: 0
 > _intel_fast_memcpy(0x7ffe4ed10685, 0x7f225a965da0, ...)
 <> _intel_fast_memcpy.P(0x7ffe4ed10685, 0x7f225a965da0, ...)
 | > __intel_ssse3_rep_memcpy(0x7ffe4ed10685, 0x7f225a965da0, ...)
 | < __intel_ssse3_rep_memcpy+0x0000000023e7 returns: 0x7ffe4ed10685
 < _intel_fast_memcpy.P+0x000000000007 returns: 0x7ffe4ed10685

FritsHoogland

#
# pmrep configuration file
#

# General options
[options]
#version = 1
#source = local:
#output = stdout
#derived = /path/derived.conf

FritsHoogland

     1	19,24c19
     2	<           xfs_file_read_iter [xfs]() {
     3	<             xfs_ilock [xfs]() {
     4	<               down_read() {
     5	<                 _cond_resched();
     6	<               }
     7	<             }
     8	---
     9	>           blkdev_read_iter() {
    10	26,28c21,47

FritsHoogland

     1	# tracer: function_graph
     2	#
     3	# CPU  DURATION                  FUNCTION CALLS
     4	# |     |   |                     |   |   |   |
     5	   0)               |  sys_pread64() {
     6	   0)   0.803 us    |    fget_light();
     7	   0)               |    vfs_read() {
     8	   0)               |      rw_verify_area() {
     9	   0)               |        security_file_permission() {
    10	   0)   0.031 us    |          cap_file_permission();

FritsHoogland

    # diff two_preads.1.clean.txt two_preads.2.clean.txt | nl
    two_preads.1.clean.txt is the original/first file, two_preads.2.clean.txt is the new/second file.
     1	38,149c38,40
     2	<                           gup_pte_range();
     3	<                         }
     4	<                         down_read() {
     5	<                           _cond_resched();
     6	<                         }
     7	<                         get_user_pages() {
     8	<                           __get_user_pages() {

FritsHoogland

     1	# tracer: function_graph
     2	#
     3	# CPU  DURATION                  FUNCTION CALLS
     4	# |     |   |                     |   |   |   |
     5	   0)               |  sys_pread64() {
     6	   0)   0.456 us    |    fget_light();
     7	   0)               |    vfs_read() {
     8	   0)               |      rw_verify_area() {
     9	   0)               |        security_file_permission() {
    10	   0)   0.040 us    |          cap_file_permission();

FritsHoogland

# tracer: function_graph
#
# CPU  DURATION                  FUNCTION CALLS
# |     |   |                     |   |   |   |
   0)               |  sys_pread64() {
   0)   0.677 us    |    fget_light();
   0)               |    vfs_read() {
   0)               |      rw_verify_area() {
   0)               |        security_file_permission() {
   0)   0.041 us    |          cap_file_permission();